31946mar's channel

Focal distance for positive diopter settings can be calculated by the formula:

F (cm) = 100 cm / diopter setting

The choice of "ninety-nine" is the unfortunate result of a literal translation. The test was originally described by a German physician who used the phrase "neun und neunzig" (pronounced [ˈnɔʏnʊntˈnɔʏntsɪç]), which he chose because it contains diphthongs, calculated to cause maximum vibration of ...

The choice of "ninety-nine" is the unfortunate result of a literal translation. The test was originally described by a German physician who used the phrase "neun und neunzig" (pronounced [ˈnɔʏnʊntˈnɔʏntsɪç]), which he chose because it contains diphthongs, calculated to cause maximum vibration of ...

The choice of "ninety-nine" is the unfortunate result of a literal translation. The test was originally described by a German physician who used the phrase "neun und neunzig" (pronounced [ˈnɔʏnʊntˈnɔʏntsɪç]), which he chose because it contains diphthongs, calculated to cause maximum vibration of...